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ITS#9278 fix robust mutex cleanup for FreeBSD

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FreeBSD 11 supports robust process-shared POSIX mutexes,
but requires them to be explicitly destroyed before munmap
This commit is contained in:
Howard Chu 2020-06-16 19:56:16 +01:00
parent 1ce8c2bcea
commit f683ffdc81
1 changed files with 16 additions and 2 deletions
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18
libraries/liblmdb/mdb.c
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@ -124,7 +124,10 @@ typedef SSIZE_T ssize_t;
#include <resolv.h> /* defines BYTE_ORDER on HPUX and Solaris */
#endif
#if defined(__APPLE__) || defined (BSD) || defined(__FreeBSD_kernel__)
#if defined(__FreeBSD__) && defined(__FreeBSD_version) && __FreeBSD_version >= 1100110
# define MDB_USE_POSIX_MUTEX 1
# define MDB_USE_ROBUST 1
#elif defined(__APPLE__) || defined (BSD) || defined(__FreeBSD_kernel__)
# define MDB_USE_POSIX_SEM 1
# define MDB_FDATASYNC fsync
#elif defined(ANDROID)
@ -1375,7 +1378,7 @@ static int mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata,
static int mdb_env_read_header(MDB_env *env, MDB_meta *meta);
static MDB_meta *mdb_env_pick_meta(const MDB_env *env);
static int mdb_env_write_meta(MDB_txn *txn);
#ifdef MDB_USE_POSIX_MUTEX /* Drop unused excl arg */
#if defined(MDB_USE_POSIX_MUTEX) && !defined(MDB_ROBUST_SUPPORTED) /* Drop unused excl arg */
# define mdb_env_close0(env, excl) mdb_env_close1(env)
#endif
static void mdb_env_close0(MDB_env *env, int excl);
@ -5133,6 +5136,17 @@ mdb_env_close0(MDB_env *env, int excl)
sem_unlink(env->me_txns->mti_wmname);
}
}
#elif defined(MDB_ROBUST_SUPPORTED)
/* If we have the filelock: If we are the
* only remaining user, clean up robust
* mutexes.
*/
if (excl == 0)
mdb_env_excl_lock(env, &excl);
if (excl > 0) {
pthread_mutex_destroy(env->me_txns->mti_rmutex);
pthread_mutex_destroy(env->me_txns->mti_wmutex);
}
#endif
munmap((void *)env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo));
}